1. Test Overview
The Swiftlink P43 20W 1.4Ghz 200km Wireless Data/Video Transmission System was tested in point-to-point mode for air-to-ground transmission of a 2Mbps code stream over a distance of 187KM (LOS).
2. Test Environment
- Test Date: March 14th, 2024 (Cloudy)
- Test Location:
- Ground Unit: The bank of the Qiantang River, east of the Yangtze River, Hangzhou City, Zhejiang Province. (Intersection of Qingshan North Road and Jiangdong Fourth Road, Qiantang District, 200 meters).
- Air Unit: The top of Qianniugang mountain, Lin’an District, Zhejiang Province, approximately 1500 meters above sea level.
3. Test Equipment:
| No | Name | Model | Quantity |
|---|---|---|---|
| 1 | 20W-P43 Video Transmission | S1400-P43 | 2 |
| 2 | 2.5dBi Small Fiberglass Antenna | 1350~1470MHz | 2 |
| 3 | 9dBi Large Fiberglass Antenna | 1350~1470MHz | 1 |
| 4 | 13dBi Directional Antenna | 1350~1470MHz | 1 |
| 5 | Hikon Camera | 2Mbps | 1 |
| 6 | Computer | 1 |
4. Test Method (2.5dBi Small Antenna to 9dBi Large Fiberglass Antenna & 13dBi Directional Antenna)
Configuration (Ground Unit): (28V Power Supply)
- The ground station is configured as the point-to-point master station with adaptive frequency, adaptive stream, and adaptive power control. Maximum transmit power is 43dBm.
- The ground station is located on the bank of Qiantang River, east of the Yangtze River, Hangzhou. The antenna setup includes one 9dBi fiberglass antenna and one 13dBi directional antenna.
- The ground station is connected to a PC.
Configuration (Air Unit): (28V Power Supply)
- The air station is configured as the point-to-point master station with adaptive frequency, adaptive stream, and adaptive power control. Maximum transmit power is 43dBm.
- The air unit is located at the top of Qianniugang mountain, Lin’an District, Hangzhou City, Zhejiang Province, with an altitude of about 1500m. The 2.5dBi small fiberglass antenna is directly connected to the device, mounted on the 1.8m high roof of a car.
- The air unit uses a Hikang camera, with the code stream set to 2Mbps.
- Due to the RS232 serial port level of the device and the TTL serial port level of the flight control, the serial port was not connected.
5. Test Results
S1400-P43 Air-to-Ground (2Mbps Code Stream)
| Background Noise | LAN1 | Serial Port | Air Unit SNR1/2 | Ground Unit SNR1/2 | Actual Distance |
|---|---|---|---|---|---|
| Air Unit: -104dBm
Ground Unit: -105dBm |
2Mbps | None | 0dB / 4dB | 0dB / 0dB | 186.9KM |
Conclusion: The ground noise is normal. Using the 2.5dBi small white antenna at the air end, the actual transmission distance is approximately 186.9KM. Under these conditions, the transmission of the 2Mbps image and video playback experienced lag, indicating that the signal-to-noise ratio had nearly reached its limit.
5.1 Air Unit Picture
The air unit is positioned at the top of the mountain, approximately 1500m above sea level, with the 2.5dBi small antenna mounted at a height of about 1.8m in a clear environment.
Air unit test
5.2 Ground Unit Picture
The ground unit is located on the bank of the Qiantang River, east of Hangzhou Dajiang, in an open environment. The antenna setup includes one 9dBi fiberglass antenna and one 13dBi directional antenna.
Ground unit setting
